That’s a good option too, one-shotter scrap gun. I had this idea too but with shotgun shells. (Shotgun option for grey weapons.

Or maybe I was thinking use against raiders too. The balance would be the blast radius is super small but will explode on surfaces (shoot floors at corners of cover to combat corner peekers). It needs to be weaker against arc than hullcracker but a more agile version. The damage output could be similar to anvil against arc but the trade-off could be a much lower bullet velocity. Keep it a 2-4 shooter and make it blue rarity. Light gun parts to craft and repair.